SNP-529(#84) transparent space below content or no rounded corner on top

[internetova]

https://github.com/surfstudio/flutter-bottom-sheet/issues/84

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Checklist for self-check

• [ ] Commits and PRs have been filed according to the rules on the project.
• [ ] The author is marked as an assigne and assigned mandatory reviewers.
• [ ] Required labels marked
• [ ] Specified related tasks and/or related PRs.
• [ ] Specified Changes.
• [ ] Attached videos/screenshots demonstrating the fix/feature.
• [ ] All unspecified fields in the PR description deleted.
• [ ] New code covered by tests.

Checklist for reviewers

• [ ] CI passed successfully (with a green check mark).
• [ ] PR is atomic, by volume no more than 400 (+-) corrected lines (not including codogen).

Design:

• [ ] System design corresponds to the agreements on structure and architecture on the project.
• [ ] The code is decomposed into necessary and sufficient components.

Functionality:

• [ ] The code solves the problem.
• [ ] Any changes to the user interface are reasonable and look good.

Complexity:

• [ ] The code is clear, easy to read, functions are small, no more than 50 lines.
• [ ] The logic is not overcomplicated, there is no overengineering (no code sections that may be needed in the future, but no one knows about it).

Tests:

• [ ] Updated or added tests for mandatory components.
• [ ] The tests are correct, helpful, and well designed/developed.

Naming:

• [ ] The naming of variables, methods, classes and other components is understandable.

Comments:

• [ ] The comments are understandable and helpful.

Documentation:

• [ ] All labels are correct
• [ ] Technical documentation updated (after approval, updates last reviewer).

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (fc90ca5) 100.00% compared to head (5f51b3a) 100.00%.

:exclamation: Current head 5f51b3a differs from pull request most recent head a6f786c. Consider uploading reports for the commit a6f786c to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #85 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 4 4 Lines 269 276 +7 ========================================= + Hits 269 276 +7 ``` | [Files Changed](https://app.codecov.io/gh/surfstudio/flutter-bottom-sheet/pull/85?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=surfstudio) | Coverage Δ | | |---|---|---| | [lib/src/flexible\_bottom\_sheet.dart](https://app.codecov.io/gh/surfstudio/flutter-bottom-sheet/pull/85?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=surfstudio#diff-bGliL3NyYy9mbGV4aWJsZV9ib3R0b21fc2hlZXQuZGFydA==) | `100.00% <100.00%> (ø)` | | | [lib/src/flexible\_bottom\_sheet\_route.dart](https://app.codecov.io/gh/surfstudio/flutter-bottom-sheet/pull/85?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=surfstudio#diff-bGliL3NyYy9mbGV4aWJsZV9ib3R0b21fc2hlZXRfcm91dGUuZGFydA==) | `100.00% <100.00%> (ø)` | |

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